Apparatus for the recovery of soda



(No Model.)

F. A. OLOUDMAN.

APPARATUS FOR THE RECOVERY OF SODA. No. 319,956. Patented June 16; 1885.

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STATES Arnar Erica.

FRANCIS A. OLOUDMAN, OF CUMBERLAND MILLS, MAINE, ASSIGNOR TO' SAMUEL D. WARREN, OF BOSTON, MASSACHUSETTS APPARATUS FOR THE SPECIFICATION forming part of Letters Patent N0. 319,956, dated June 16, 1885.

Application filed January .26, 1885.

To all whom it may concern.-

Be it known that I, FRANCIS A. CLOUDMAN, of Cumberland Mills, county of Cumberland, State of Maine, have invented an Improvement in Reclaiming-Furnaces, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

My invention has for its object to provide an apparatus or furnace for reclaiming chemicals from spent liquors of pulp-mill digesters, wherein the spent liquor may be continuously fed to the evaporating-pans and be run from thence into the furnace to be incinerated, whence it moves toward the outlet of the furnace and is discharged therefrom in finished condition, whereby much time, labor, and fuel are saved and damage to the furnace is lessened by reason of frequent extreme changes in temperature.

This invention is an improvement on the class of furnaces shown in United States Patent No. 262,443. To attain these results I provide, in connection with a fire-box and a set of evaporating-pans, an interposed rotating cylinder having axial inlet and outlet openings, the inlet (next the evaporating-trays) being preferably of less diameter than the outlet, (next the fire-box,) while the interior walls of said cylinder are made conical or sloped from the former toward the latter. The eye of the fire-box next the outlet of the rotating cylinder is irregular in shape, it resembling a segment or having a flattened portion, which is inclined to a line drawn horizontally through the center of the said cylinder, so as to provide an opening or space'between the said outlet and the eye of the fire-box, whereby, as the chemical or chemicals are incinerated in the rotating furnace, they shall move toward the outlet and be discharged therefrom through the space mentioned upon a chute, which leads to a suitable receptacle. The mouth of lowest evaporatingtray is provided with a low hearth, which obstructs the flow of the partially incinerated or evaporated liquor from said tray into the cylinder, the said hearth having an opening and a plug-valve, the latter being attached to the arm of a plug-open (N0 model.)

' ating device, shown'as a crank-shaft, which is extended through one side of the chamber and receives a crank or handle to enable the plug to be operated. The evaporating-trays are arranged one above another from alternate ends of the chamber, so that the spent liquor from the usual tank or reservoir will flow in zigzag course over the surface of one tray to another, down through the series of trays until the bottom of the chamber is reached, thence through the valve in the hearth into the rotating cylinder.

Figure 1 shows in longitudinal vertical section an apparatus embodying my invent-ion, the section being in line or x of Fig. 2. Fig. 2 is a transverse vertical section on liney y, Fig. 1, looking in the direction of the arrow 2; Fig. 3, a similar View on line 2 a, Fig. 1, looking in the direction of arrow 3.

The fire-box A, having grate a, wall a, and other usual appurtenances, is provided with a segmental-shaped flue opening or eye, whose wall or flange b, with the exception of a flattened portion, b, is of circular outline. The flattened portion b of the flue opening or eye inclines upward and outward at an acute angle with relation to a line drawn horizontally through the bottom of said flue-opening, as clearly shown in Fig. 2, the purpose of which will be presently set forth. The rotating cylinder O at its periphery is provided with trucks 0, running on grooved pulleys c,mount-' ed on the blocks B, the said cylinder being rotated in any suitable way after the manner in which cylinders for similar purposes and cylinders in sugar-granulators are rotated. The interior of the cylinder is conical in shape, sloping from the evaporating-chamber toward the fire-box, the end of the furnace toward the fire-box being provided with an outlet, d, of greater diameter than the inlet 01 at the other end of the cylinder. The. circular part of the outlet fits closelyover the circular part of the flue opening or eye I), leaving a space, 5, (see Fig. 2,) between it and the flattened portion 12 of the said eye to permit the discharge from the cylinder of the material therein when incinerated. A chute, e, is arranged between the fire-box and cylinder and below the opening or space 5 thus provided,the chute receiva suitable receptacle.

ing and conveying the discharged material to The liquor containing the chemicals to be received is let into the tray 9 from a suitable tank or reservoir, from which it flows in zigzag course onto and over a series of trays, g 9 arranged as shown, and from the tray 9 to the bottom h of the evaporating-chamber, where the hearth h obstructs its further flow. The hearth h islocated at the mouth of the evaporating-chamber F, and projects into the inlet d of the cylinder,so thatthe chemicals, freed from a verylarge amount of liquor,may at the desired time and at proper speed be permitted to flow from the evaporating-chamber through the valve-opening n in said hearth into the rotating cylinder 0, the

valve-opening being in this instance shown as a plug, i, attached to the arm 1" ofa crank-shaft, k, which projects through the walls of the evaporating-chamber F, and receives a crank or handle, 70, (shown in dotted lines, Fig. 3,) to operate the same. Fire having been started in the fire-box A the products of combustion pass through the rotating-cylinder O, thence into the evaporating-chamber F, and under and over the several trays into the smokepipe, (not shown,) whereby a rapid but partial evaporation of the spent liquor flowing over said trays is obtained, so that by the time the liquor reaches the bottom h of the evaporating-chamber it is in condition to a be allowed to flow through the valve-opening into the cylinder, where, by reason of the intense heat and the rotation of said cylinder, it is rapidly incinerated, so as to be freed from resins and other impurities. Owing to the rotation of the cylinder in the direction of the arrow 4, Fig.- 2, the body of sodaor other incinerated chemical contained therein has a tendency to be carried from the bottom of said cylinder up one side thereof, ,so that the surface of the loose mass of the said soda stands therein in the same general direction as the chute, the surface of the mass, owing to the inclination or slope of the inner wall of the rotating cylinder and also to the pressure of incoming material passing out from the delivery-opening of the cylinder between it and the eye b at the space 5, and by feeding the liquor into the evaporating-chamber F at regulated speed and discharging it slowly through the opening a into the cylinder a substantially continuous discharge of the recovered material may be had from the cylinder. If it is desired to reach the interior of the cy1inder,it may be done through the opening or space 5 at one side of the eye.

The fire-box may be made stationary or movable with relation to the cylinder, as may be desired.

I claim- 1. In apparatus for reclaiming soda from the spent liquor of pulp-mill digesters, the combination, with a rotating cylinder having an axial outlet, d, of a fire-box provided with an irregular-shaped outlet or eye, b b, adja cent to the outlet d of the cylinder and entering the same, the eye being shaped to provide a space between it and the axial outlet d,thus affording a discharging-space to operate, substantially as and for the purpose set forth.

2. The combination, with a rotating cylinder having circular axial inlet and outlet openings and sloping interior, as specified, of afirebox having an irregular partially circular eye, b b, entering the outlet of the cylinder to provide an exit or space between said fine and outlet openings, as and for the purpose specified.

3. The combination, with a rotating cylinder having a projecting outlet, a, and a fire box having an irregular eye opening next the outlet of the furnace to thereby provide an exit or space between the two, of a chute located below the exit or space, as specified.

4. The combination, with a rotating cylinder having an axial inlet and outlet and a firebox having a flue-opening, b b, next the cylinder-outlet, of an evaporating-chamber having an opening next the cylinder-inlet, and provided with a series of trays, one above another,and projecting alternately from either end of said chamber, and a smoke-exit located above the topmost tray, as and for the purpose set forth.

5. The rotating cylinder having an axial in let, as specified, and an evaporating-chamber provided with a hearth adjacent to the cylinder-inlet and having avalve-opening combined with a valve or plug,and with means,substantially as described, to operate it, as set forth.

Intestimony whereofl have signed my name to this specification in the presence of two subscribing witnesses.

FRANCIS A. OLOUDMAN.

WVitnesses:

CHARLES E. JACKSON, JNo. E. WARREN.

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